rss feeds page not found problem using cp 3.1.2
hi, i'm using cp 3.1.2 on windows server platform, i set up the permalink as: /index.php/%postname%. Now i'm facing this problem: when i click over the rss icon on top of the home-page i get this message "Whoops! Page Not Found. The page or ad listing you are trying to reach no longer exists or has expired."
(i get the same problem even when i click the small rss icon of the Categories tags)
Could you help me please?